Sanding machine



0ct. 26, 1948. .H. s. NEWTON 2,452,206

SANDING MACHINE v Filed July 2, 194e 2v sheets-sheet 1 SAND'ING MACHINE 2 Sheets-Sheet 2- Filed July 2, 1946 INVENTOR.

Patented Get. 26, 1948 45ans UNI TED S TEfS G ifi-FME sANniNG MacniNE *Herman S. Newton,xTemple, Tex. Application JulyjZ, 1946, SeralNo. '681,054

:This A'invention relates to polishing, abrasive or sanding machines and more particularly to sanding machines employed in metal Working and wood working.

`The objects of the invention are, first, to provide an all purpose polishing, abrasive or sanding machine inthe sense that it is equipped with a double ended working head capable fof vertical, diagonal, horizontal and rotative displacement and,`by virtue of pulleys oneach -end of the head, a belt may be used for vertical, diagonal or -horizontal polishing, abrasive action or sanding. Second, the provision of a polishing,` abrasive or sanding head having such 'a variable ilexibility that itfmaybe conveniently-'and quicklymoved to any one of a variety of fpos'itions'best suited to the type of work being performed. Third, the'provision of a convertible polishingyabrasive orjsanding head capable of operating various types of polishing, abrasive, sanding, or metal `wor-king and wood working attachments.

Another object oi the invention is to'vprovide a polishing, abrasive or sanding machine so constructed as to be readily adaptable for stationary mounting on suitable yfloor standard.

Other objects of the vinvention include a removable platen resisting vpressure of Work on a belt polisher, abrasive kor sander when employed; a telescoping spring adjustment, combined with a tiltable spindle bearing for maintaining proper and constant 'tension on the lrespective belt'em'- ployed.

With the foregoing objects as para-mount, the invention has Afurther reference to certain features of accomplishment which will Ybecome apparent 'as the description proceeds, taken in connection with the accompanying drawings wherein:

Figure 1 is a side elevation 'of a polishing, abrasive ior sanding machine constructed according to theinvention, showing the belt disposed `hori zontally.

Figure 2 is a perspective 'view of ya polishing, abrasive or sanding'machine constructed according to the invention.

Figure 3 is a front perspective view of theremovable platen.

Figure-4 is a plan view of apolishing, abrasive or sanding machine with `partial cross section showing telescopic compression spring, and

Figure 5 is a .perspective view of .that portion of the machine in which the Aelectric switch is mounted and including a partial vcross section disclosing a 'fiat coil spring in relation 'to the-cap housing and bolt.

:5 sClaima ((21.551-#1353 -Continuing with amore detailed description of the drawings, -reference lnumeral I denotes a ceiiingp'late 'for suspension of the machine from a ceiling. Abolt '2 is passed downward through the center of the ceiling vplate i, through the center of a ball-'bearing `race 3 and through an inverted U-shaped bracket '4 and held securely in piace by ,nut 5. Abolt 6 'is passed through Ythe two ends vof theinverted 'U-shaped bracket #l and the uppermost part'of tubular section ,'l and held securely in p'lace by means of -a nut 8. The conf junctive relationship of parts 1,2, il, 5,15, l, and 6l creates a Vsuspension element, permits va free SGOdegree rotation 'oi vt'lie'machine and vallows the machine to Ibe swung back and Aforth to 'fully cover the workingsurface `ofthe vworkbeing done bythe polishing, rabrasive or sanding-machine.

Tubular sections 'l vand 9 are telescopically related for purposes of raising and lowering the machine tothe desired or necessary-position for-work andare uheld in the desired or necessary elevated position f-orwork by suitable'means such as thumb screw Ii).

An electric motor Ii is mounted to the work head of the polishing, abrasive or sanding machine by means of a bell-shaped `casting I2 through the use oi attachment bolts common to such types of motors or by other means commonly employed in making such attachments.

As .an integral part of Yand continuous with the bell-shaped casting "I`2, .the Acasting proceeds in an irregular, though `substantially cylindrical shape receiving the end of a tubular element I 3 to which reference will again bezmade presently. Concentrically disposed lin the :element vi3 is another tubular member lawhichreceives telescopically the vsection of-member I4, whereby the relation of the tubular members I3, I4 and I5a eachto the other will permit longitudinal displacement of varying distances desired or necessary to perform the work at hand andare held securely atthe `'desired .or'necessary displacement position by suitable means such "as thumb'screw I 5.

For yconvenience inl adjusting the lworking head o'f'the machineto the proper position 'for thework being done, a handle i6 is attached to a casting I @b on-one yend of tubularmember UI by means of screws through the 'base of handle I6, so shaped as to conform to vthe contour of that portion of casting Mb to which fit isattached.

Thrcugha suitable opening yin member M an axle housing I7 is inserted for support and placement maintenance Y'of a free pulley It which is secured to the axle -ISioy means ofja'nut i 9a. In orderito'sec'ure propentrackingof-belt v2li, the male threaded end of control knob 2| penetrates a female threaded opening in casting |4b to rest bluntly against the axle housing I'I for purposes of tilting free pulley I8 in a manner and to the degree desired or necessary to secure and maintain proper tracking of the belt 28.

Disposed longitudinally within tubular member Ia is a compression spring 22 with one end bearing against a solid section of casting I2 at point 23, and whose opposite end bearsag'ainst the end of the telescoping-section of tubular member I4 at point 24, the coil compression spring 22 maintain'- ing a constant pressure against the inserted end Iof telescoping section of member I4, thus auto matically maintaining a correct and constant tension on the belt 2Il. Fixation of the tubular sections I S and I4 is effected by,means of thumb screw I5. l

In an annular housing 25 of the cylindrical section of tubular element I3 is anchored the outer end of a flat coil or clock type spring 26, the inner end of which is aioxed to the inner end of a sleeve ISa which carries an integral flange l3b, closing the open end of annular housing 25, the arrangement being such asto create a torque intermediate the ends of the tubular assembly, permitting a manual or automaticrotative action tc counterbalance the Weight of the motor and will permit the contact surface of the belt 20 to conform to the surface of the Work wlhen the belt 20 is brought into Working contact with the work being done. .1

A cylindrical and integral part 21 of casting I3 protrudes from the back of `and perpendicular to the longitudinal axis of casting I3` and is received in a cylindrical housing 21a which is an integral part of tubular section 9. In a cap housing 28 and through a spline 29 is anchored the outside end of a iiatcoil Spring 30, the inside endof which is operatively attached to a bolt 3l which is xedly secured in the center of the end of cylindrical part 21. The cap housing 28 serves as an adjustable anchor at spline 29 for the fiat coil spring 3i) and proper relative positions of cap housing 28, the cylindrical part 2l and the flat coil spring 3Q`is maintained` by means of double locking nuts 32. The function of the flat coil spring 30 is to counterbalance the Weight of the motor II so that the forward end of the working head may be raised and lowered to conform to the work. Theworking head may be secured in a horizontal position by means of a screw 33.

To the protruding end of motor shaft 34, which extends through the bell shaped housing I2, pulley is operatively attache'diby means of slot and key locking device common to this type of assembly.

When the sanding machine is inoperative or when work is being performed on the underside of belt 2da removable guard 36 may be secured in place by means of pins 35a attached to the rear thereof and which enter apertures 35h in the bosses 36a and which are integrally formed on the tubular casting I3. When Workis to be performed on the upper side of. the belt 20 the removable guard 36 may be removed to permit 4 on the belt 2I| under the pressure of work being performed on the upperside of contact surface of belt 20.

At the lower end of, and formed integrally with, tubular section 9 and cylindrical housing 21a. is an inverted cylindrical recess 4!! capable of telescopically receiving the upper end 42 of a tubular section of a suitable floor standard and secured in position by a thumbscrew 4I. The purpose of this assembly is to permit j the sanding machine head lto be mounted on a floor standl ard for the performance of such types of work free access of the Work to the `contact surface of as may require such assembly, without removing the head from the suspension mechanism.

From the foregoing, it is apparent that by virtue of the highly variable flexibility of the polishing, abrasive or sanding machine, a highly versatile machine is afforded, and it is pointed out that the'primary purpose of this machine is to have the abrasive belt 20 Contact the work at area X. Pulley I8 is to be any of several types of conventional =soft surface wheels available for this purpose. Working area X is the most commonly used surface on the abrasive belt, though the platenV arrangement does afford an additional working surface.

Manifestly, the construction of such a polishing, abrasive or sanding machine as shown and described iscapable of some modification and suchmodiiication may be construed as falling Withinthe scope and meaning of the appended claims is also considered to be within the spirit and intent of the invention.

What is claimed is:

l. A polishing, abrading and sanding machine comprising an elongated body consisting of two telescopically related members one of which has a lateral extension thereon, a suspension member adapted to be attached at one end to an overhead support and having a housing on its opposite end embracing'said lateral extension, spring torsion means having one end stationary with respect to said housing and its opposite end stationary with respect to said extension to resist oscillative displacement of said body on the axis defined by said extension.

2. A-polishing, abrading and sanding machine comprising an elongated body consisting of two telescopically related tubular members normally extended under'sprlng compression, one of said members carrying a motor and having a lateral mounting member thereon on which said body is arranged to oscillate, a pulley on the shaft of said motor, a second pulley carried by the cornpanion member Whose shaft is parallel with that of said first pulley, an abrasive sheet surrounding said pulleys, a torsion spring surrounding said body and adapted to resist rotative displacement of said body about its longitudinal axis.

3. A polishing, abrading and sanding machine comprising an elongated body consisting of two telescopically related tubular members normally extended under spring compression, one of said members carrying a motor and having a lateral mounting member thereon on which said body is arranged to oscillate, a pulley on the shaft of said motor, a second pulley carried by the companion member whose shaft is parallel with that of said first pulley, an abrasive sheet surrounding said pulleys, a torsion spring surrounding said body to resist rotation thereof about its longitudinal axis, a second torsion spring embracing the lateral mounting member of said rst tubular member for resisting oscillative displacement of Said body transverse to its longitudinal axis.

4. The structure set forth in claim 2, further defined in that a second torsion spring is mounted relative to the lateral mounting member and adapted to resist variable displacement of the body transverse to the normal horizontal position thereof.

5. A polishing, abrading and sanding machine including an elongated body, means affixed to said body in transverse relation to the longitudinal axis thereof at its mid-section for suspending said body from an overhead support for vertical adjustment, torsion means embracing said body for resisting rotation of the latter about its longitudinal axis, and torsion means embracing said transverse suspension means for resisting oscil- 15 2,416,493

HERMAN S. NEWTON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,365,583 Brown Jan. 11, 1921 1,821,624 Emmons Sept. 1, 1931 2,401,670 Spetz June 4, 1946 NeWtOn Feb. 25, 1947 

